What is CVE-2021-43298?

CVE-2021-43298 is a critical-severity vulnerability in Embedthis Goahead, classified under CWE-208. CVSS score: 9.8/10. Published 2022-01-25.

How severe is CVE-2021-43298?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Embedthis Goahead

CVE-2021-43298

The code that performs password matching when using 'Basic' HTTP authentication does not use a constant-time memcmp and has no rate-limiting. This means that an unauthenticated network attacker can brute-force the HTTP basic password, byte-by-byte, by recording the webserver's response time until the unauthorized (401) response.

Published 2022-01-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.023 (82.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000

Affected products

Embedthis Goahead — versions unspecified

Weakness classification (CWE)

References

github.com/embedthis/goahead/issues/304 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-43298?: CVE-2021-43298 is a critical-severity vulnerability in Embedthis Goahead, classified under CWE-208. CVSS score: 9.8/10. Published 2022-01-25.
How severe is CVE-2021-43298?: Critical severity. CVSS v3 base score is 9.8 out of 10.